采用激光快速成形技术在纯钛基板上制备了Ti_70.38Fe_26.39Sn_2.93Y_0.3四元共晶合金成形体,测试研究了该合金成形体的微观组织、硬度、弹性模量和耐蚀性能，并与Ti_70.58Fe_29.42二元共晶合金成形体进行了对比。分析结果表明，在激光快速成形非平衡凝固条件下，Ti_70.38Fe_26.39Sn_2.93Y_0.3合金成形体的凝固组织是TiFe初晶和β-Ti+TiFe共晶组成的过共晶组织。与Ti_70.58Fe_29.42二元共晶合金成形体相比，Ti_70.38Fe_26.39Sn_2.93Y_0.3合金成形体的硬度提高了59.6%，弹性模量降低了30%，且在Hank′s溶液中展示出优异的耐蚀性。

A quaternary eutectic alloy composed of Ti_70.38Fe_26.39Sn_2.93Y_0.3 is prepared on a pure titanium substrate with the laser rapid prototyping technique. The microstructure, hardness, elastic modulus, and corrosion resistance of the alloy are tested and investigated, and the comparison with those of the Ti_70.58Fe_29.42binary eutectic alloy is made as well. The analysis results show that, under the non-equilibrium solidification condition of laser rapid prototyping, the solidification structure of Ti_70.38Fe_26.39Sn_2.93Y_0.3 alloy is a hypereutectic one which composed of the primary TiFe and β-Ti+TiFe eutectic. Compared with those of Ti_70.58Fe_29.42binary eutectic alloy, the hardness of Ti_70.38Fe_26.39Sn_2.93Y_0.3 alloy is increased by 59.6%, the elastic modulus is decreased by 30%, and the Ti_70.38Fe_26.39Sn_2.93Y_0.3 alloy possesses an excellent property of corrosion resistance in Hank′s solution.